Awnings used to be a big business in Pittsburgh. The awning men would come to your house in the spring and put canvas awnings over your doors and windows for summer shade, and then in the fall they would come around and take down the awnings and take them away to be cleaned and put in storage, and then in the spring you would get fresh awnings again. (You can still find one or two services that will do that for you.)

Obviously you have to spend some money on this service, and that limited it largely to the upper middle classes and above. When someone had the brilliant idea of making awnings out of cheap aluminum, however, the floodgates were opened, and every working-class house could at least have a little awning over its front door to shelter the residents while they fumbled for their keys in the rain.

On some streets—as here on 24th Street—you can still pass one aluminum awning after another, often a bit bedraggled but still clinging to its house.

These awnings were made by a number of different manufacturers, and they came in a wide variety of shapes.

Aluminum awnings were supposedly open to the objection that, when the sun was beating on them, they created a pocket of hot air under them. (How much of a worry this really is old Pa Pitt could not tell you, but it sounded plausible in the mouth of a salesman.) The problem was supposedly solved, however, by the ingenuity of the Kool Vent Metal Awning Corp. of America,¹ which invented and patented diagonal louvers on the sides of the awning that were supposed to allow the hot air to escape from under the awning—an invention described thus:

An awning adapted to be fastened to a wall or the like support, including a curtain comprising a series of spaced overlapping parallel vertical depending plates, angling outwardly from the awning toward the wall at not more than ninety degrees.

Here we see the diagonal arrangement, designed so that the “vertical depending plates” still provide reasonable shelter from blowing rain but allow air to escape between them. Other awning companies imitated this arrangement, but Kool Vent successfully sued them, enforced its patent, and became the king of the aluminum-awning companies.

The architectural historian Franklin Toker facetiously suggested that the South Side should be declared a Kool Vent Awning historic district, and although other neighborhoods—Bloomfield, for example, and South Oakland—also have large Kool Vent infestations, the South Side probably preserves Kool Vent awnings and their competitors in greater numbers and density than any other neighborhood. All the awnings in this article were found in one block of South 24th Street.

1. At various times the name seems to have been spelled Kool-Vent and Koolvent as well; here we adopt the spelling used in court documents. ↩︎